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AllanJAshinoff-5533 asked YukiSun-MSFT commented

Question about the 5 Domains hosted on Microsoft365

My organization has 6 registered domains. One we rely on and the other 5 are ancillary and used to a lesser extent by fewer people. All of these domains are listed when I look in Microsoft365 and 4 of the 5 show their DNS coming from AWS and the last shows its DNS hosted at a third party.

Aside from the primary, none of the remaining domains are showing up with active user accounts in the Microsoft365 admin interface.

I'm moving our company to SonicWall's Web App Security for Office365 from ProofPoint. SWAS sits parallel to Microsoft365 in the cloud and filter before email arrives at our inboxes. But SWAS is designed only to work with Office365 and its applications.

Since all of these domains are listed within Microsoft365's domains area does that mean that all of that email passes through Microsoft365 when people are retrieving their mail? If so, then these 5 domains will be filtered by SWAS since they are passing through Microsoft365 en-route to the end-users mailboxes. If not, then I need to find an alternative solution to email filtering for those 5 domains.

I know its confusing. I'm still sorting this out myself but the money involved in changing things is too substantial not to ask questions.

Thanks in advance

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Hi @AllanJAshinoff-5533

As from your description the questions is related to Exchange Online, I'll add a tag for it so that this thread can also be seen by community members who are faimilar with Exchange Online and are checking the Exchange-online related tags.

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YukiSun-MSFT answered YukiSun-MSFT commented

Hi @AllanJAshinoff-5533

Since all of these domains are listed within Microsoft365's domains area does that mean that all of that email passes through Microsoft365 when people are retrieving their mail?

Have you already updated these domain's MX records to point to Microsoft 365? If haven't, per my understanding emails to that domian won't pass through Microsoft 365.

Reference: Domains FAQ
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I haven't adjust anything yet. Things were spread out by my predecessor so Microsoft365 has the listings for all of the domains, but for some reason they are having a variety of minor issues that do not appear to be preventing email delivery. Aside from our primary 4 or the 5 other domains are listed with AWS and another from a third party. I am working to gain access to AWS so I can examine and adjust those domains DNS entries. As for the last, no one seems to know anything about that third party host I'm up against a wall.

My question stems from trying to understand where the relevant records reside as we switch email filters. If the are all through Microsoft365 than we're fine. If not, than those who aren't through Windows365 require a different solution.

Unfortunately we've had too many cooks and I get to fix the soup.

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Hi @AllanJAshinoff-5533,

Not sure if I've understood your query correctly but if you are trying to integrating your Microsoft365 environment with a third-party spam filtering service, here's an official docuement which could be of some help:
Manage mail flow using a third-party cloud service with Exchange Online


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